03-01-2011, 10:43 AM
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BY
UMA AGARWAL
BHARAT SANCHAR NIGAM LIMITED
it is the worlds’ 7th largest telecommunication company
largest public sector units in India
it provides telecom services with ICT application in rural and urban areas
offers wide ranging and most transparent tariff schemes
lends a helping hand to the government for e–governance projects
BSNL Subscribers
Cell phones: 267.23 million (April 2008)
Land Lines: 39.42 million (March 2008)
Yearly Cell phone Addition: 83 million (2007)
Broadband connection: 3.47 million (Feb 2008)
TDMA
ISI54 standard specifies traffic on digital voice channels
initial implementation triples the calling capacity of AMPS systems
capacity improvements of 6 to 15 times that of AMPS are possible
many blocks of spectrum in 800 MHz and 1900 MHz are used
all transmissions are digital
CDMA
is a digital air interface, claiming 8 to 15 times the capacity of analog
employs a commercial adaptation of military, spread spectrum and single side band technology
every CDMA cell site can use the same 1.25 MHz band
has soft capacity limit
Mobility Management
it includes location registration, paging and handover
it should be able to access services at any location
global roaming should be provided with the help of WLANs’
need not do location registration every time
can instead do concatenated location registration
